Peter Q. George (K1XRB) said:
In answer to your question, more than likely the old Channel 68 stick will not be removed. From what I've been told, if the old Channel 68 antenna were to be removed and not replaced with a new antenna, the owners of the tower automatically lose that air space which is currently protected up to the beacon on the top of the 68 stick. Since 9/11, air space in and around Logan Airport is rigidly controlled (with good reason). It is currently grandfathered with the FAA. If the old Channel 68 antenna were to be removed (and not replaced), the clearance that the area (where the 68 antenna is) would be rescinded unless a special waiver were to be made. Airspace and tower space are at a premium now. 9/11 changed everything. Even if the 68 antenna laid dormant for years, it is structurally stable. It is a part of the buildings' structure. It now is a placeholder for the next tenant.
The Pru gets lightning strikes quite often and thanks to a good ground system, those lightning suppression units do the job well.